Railway switch controlling apparatus



July 9, 1935. c. A. BROOKS RAILWAY SWITCH CONTROLLING APPARATUS.llllllll r-IL Filed July 24, 1954 Laich Contact INVENTOR Charles A.Brooks BY 1 HIS A TTORNEY.

1 other.

Patented July 9, 1935 orFicE- e "am s RAILWAY SWITCH f CharlesA..Brooks,..swissvalcfffan, ass'ignor'thiThe Union Switch 8*, SignalChmpan'y, 'j swi'ssuaile,

' Paz,a-corporation'oflennsylvania .applicationmay 24,.1934, semi No.736,665

' Claims; (Gl."246'-'141)' My invention, .relates to :railway switch:con?- trolling apparatus of. the type *whereim'a railway trackswitch. iscontrolled .byamanuallyioperahle :lever and by a: trafiic controlledcontact, and wherein release means is provided for controllingtheuswitch. when the 'traflicv controlled contact is opened. r

-Oneieature of my inventionis the provision. or release :means forcontrolling operations of ca .iraillwaymtrack switch to.itsenormalandareverse positions, irrespective of whetherthexlast praviously attempted operation of ltheswitch-was completed or not.

I "will describe one form of apparatus embodying. my invention, and willthen pointourt. the novelz'featuresthereofin. claims. r i

The accompanying. drawing: is a. diagrammatic view showing one .form ofapparatus embodying invention. 6 Referring .to the drawing, thereference. char- .acters. .l and i designate the track .railsxof: 1astretch of main track Y which is divided lby linsulated joints 2 totorma track section The track section .w-dlis. provided:with aswlitch Fleadinglintoaside track.Z.. Trackxsedtiomw-rd is provided withza.trackrcircuit including a bait- Jterv fconnected acrosstheirailsiad'jacent one:end

of the section, andatrack relay cdesignaited by .the reference characterTconriected across the .railsadjacent the opposite end. of the section;

The switch vl is. operated -by :a mechanism- M which may be of the fluidpressure motor-type.

= Mechanism. M is controlled .by a lock magnet m and by normal andreversemagnets n and rtfior causing mechanism M to operatesswitch l tothe normal or reverse positions respectively. Maganets hand 1:lareacontrollediby a manually operable lever V, a polarized relaywA, alock relay L,

a and a manually operable time release E. Mag- :net m is controlled bylever andzbyva polarized switch indication relay K. I

As showninthe drawing-,-lever v hasa normal given portion of themovement of'l'evefV from either of its extreme positions vN and R .tothe during which each of the contacts operatedtloy Mlever'V is-closed isindicated by a referencewchamacter adjacent the symbol forthe'contactQsuch,

, tor-example, aszathe::referenceccharacter Nmz'atlja- "reverse' to itsnormal (position. L'Loek..relay ILYis. energized by a cir- The portionof the movement ofnleuer V cent; the symholrfor zcontact 5| 1;, whichindicates .thaztillnisaclosed avhileezlever V.:is in. its. N.pesitimnson'in positiomorin any: other. posiitiorrhetweentheseitwopcsitions; 'lfiris.:alsn::prnvi'd'ed;withalatchlcontact 9 =5operatedinrarwell-iknnmrmanner by a -.-latch.cassociated lever Contact 9is cpeneckwvhaen :lever l-viszimitslpositions N or R butrhecomesnclnsedwhen:theflevermanstarts tomove -1euer and R positions.

Movement-zofiileveri l'l':between:its st and 3 posilis controlled:ina'rwel-l-kncwn manner :by amomnamockniagnet NMi cont-rolling .a dog 3'mhiclmsengages a. notched segment 4- :rigidly .attachedi'ito lever:Movement of lever be itweenits andiaD positions; cisasimilarly:controlled by-1a neverseeloclc magnet Hfhettimemeleasingdevice Ermay beof thewellziknown.. mammllywoperable screw type in which thesperimdcofioperaation .-is..not measured .but is Jvamiable rho-sometext'ent byztheoperator or lever- .mperation. of smchna releasingdevice, howevenrmfiorcesuan. appreciable time delay in..connection:with.o11emtion of rather parts of the -apparatns Releasing.devicecE is equipped with 125 anmormadly closed .iCQIItELCt-CZE which:opens at when device E occupies its reversezposition. The

construction :ot silence .E; .is such that there is -an entfcrceditime:delay z-between :the. opening of contactimrand the closing of.contactifi', and also between the open-ingof contac'tifi and theclosing I contact 2T when-thedevice E -isactuated from its to l-tsreverse position. Similar time dlays'mre enfbrced between the opening ofcontact 2T andtlretclcsing' of contact "6, and between theppen'ingofcontact '6 'and'the closingof contactlfiftihen'theldevice Eisactuatedirom its cuit which is Controlled by track relay 'I, but

man also :beenergized .by a circuit controlled by contact 6 hi release.E.

. Switchgindication relay K is-of the polarized 'xtyrpe, rand .StiS-ISD!controlled by .a pole-changer P :operated 'sbyrswiteh F :as to beenergized by ourmentifotnormalipolarity when switchF occupies aitssnomalto be energized by-current of reverse polarity when switch F occupiesits reverse position.

Relay A is also of the polarized type and is so controlled by lever V asto be operated by current of one polarity when lever V is in itsposition B, and to be operated by current of the reverse polarity whenlever V is in its position D. Current of either polarity applied to thewindings of relay A is controlled by latch contact 9 and by relay L, andalso by either con-. tact 6 of release E or by relay T. Althoughrelay Ais illustrated as a polarized relay having two windings in order toeconomize contacts on lever V, either an ordinarypolarized relay havingone Winding or two neutral relays can be adapted to be controlled byleve'r V in the D and B positions, to accomplish the same results as areobtained with relay A.

As shown in the drawing, all parts arein a normal condition; that is,lever V and release E are in their normal positions; switch F is in itsnormal position, and section H is unoccupied. With section adunoccupied,relayT is energized. With relay T energized, relay L isenergized by a circuit passing from terminal b of a suitable source ofcurrent not shown in the drawing, through contact 5 of relay T, wire I,and the winding of relay L, to terminal 0 of the same source of current.With relay L energized, the normal magnet 11. is energized by a circuitpassing from terminal b, through contact 26 of release E, the frontpoint of contact 28 of relay L, contact 29 of relay A in its right-handposition, contact 30 of lever V, and the winding of magnet 11 toterminal 0. A second circuit for magnet n is also closed, passing fromterminal 17, through contact 32 of lever V, and the winding of magnet nto terminal 0. With switch F in its normal position, pole-changer P isin the position in which current of normal polarity is supplied fromterminal b through the winding of relay K to terminal 0. Except forlatch contact 9, which is open, a circuit would be complete forenergizing normal lock magnet NM. Since lever V is not in either its Bor its D position, relay A is deenergized, Relay A is, however, of thetype in which its polar contacts remain closed in the positioncorresponding to the last previous direction of energization of itswindings, and hence contact 29 is closed in its righthand position sincethis relay was last previously energized by current of normal polaritybecause of lever V having moved through its position B to its positionN.

If now, assuming that all parts of the apparatus are in the normalcondition as just described, the leverman desires to operate switch F toits reverse position; he will first close latch contact 9, therebycompleting a circuit for lock magnet NM, passing from terminal I),through contact 5 of relay T, wire I, contact 8 of relay L, latchcontact 9, wire l0, contact ll of lever V, wire [1, and the winding ofmagnet NM to terminal 0. Magnet NM, upon becoming energized, raises theassociated dog 3 so that it will not engage the upper projection of theassociated segment 4, and will therefore permit lever V to be moved toits position D.

With lever V moved to its position D, relay A will be energized bycurrent of reverse polarity in a circuit passing from terminal I),-through contact 5' of relay T, wire I, contact 8' of relay L, latchcontact 9, wire*22, -contact 24 of lever V, and the right-hand portionof the winding of With relay A energized relay A to terminal 0.

by current of reverse polarity, and with lever V in its position D, acircuit is now completed for energizing magnet r, passing from terminalI), through contact 26 of release E, front point of contact 28 of relayL, contact 29 of relay A in its left-hand position, contact 3| of leverV, and the winding of magnet r to terminal 0. A circuit is also nowcompleted for energizing lock magnet m, passing from terminal I),through the front point of contact [3 of relay K, contact I8 of lever V,contact [9 of relay K in its left-hand position, wire 25, and thewinding of magnet m to terminal 0.

With magnets m and r thus energized, mechanism M will move switch F toits reverse position. Switch F, at the beginning of its movement fromthe normal to the reverse position, opens the contacts of pole-changerP, causing relay K to become deenergized. Contact I3 of relay Ktherefore opens at its front point, and closes at its back point,thereby completing a second circuit for energizing magnet m, passingfrom terminal b, through the back point of contact l3 of relay K, wire25, and the winding of magnet m through terminal 0.

Switch F, upon completing its movement to the reverse position, causespole-changer P to close its contacts in the reverse position, whichthereupon causes current of reverse polarity to be supplied to thewinding of relay K. With relay K energized in the reverse direction, acircuit will be completed for energizing reverse lock magnet RM, passingfrom terminal b, through the front point of contact l3 of relay K,contact l8 of lever V, contact [9 of relay K in the right-hand position,contact 20 of lever V, wire 2|, and the winding of lock magnet RM toterminal 0. Magnet RM, upon becoming energized, lifts the associated dog3, thereby preventing the engagement of dog 3 with the upper projectionof the associated segment 4. The leverman will therefore now completethe movement of lever V from its D position to its R position.

The procedure to be followed and the operation of the apparatus forreturning switch F to its normal position under normal conditions bymoving lever V from its position R to its position B,

is similar to that just described for the operation of the switch to itsreverse position, and will therefore be readily understood by referenceto the drawing, without further detailed description.

I will next assume that all parts of the apparatus have been returned totheir normal condition and that track relay T becomes deenergized,either on account of the presence of the train or for some other reason.If the leverman desires to reverse switch F while track relay T isdeenergized, he will attempt to do so by operating release E to itsintermediate position, in which its contact 6 becomes closed. On accountof relay T being deenergized, the normal ener gizing circuit for relay Lwill be open at contact 5 of relay T, but a second circuit forenergizing relay L will now be closed, passing from terminal b, throughcontact 6 of release E, wire 1, and the winding of relay L to terminal0.

If now the leverman closes latch contact 9 preparatory to moving lever Vfrom its at to its j D position, a second circuit will be closed forenergizing lock magnet NM, which is the same as the circuit previouslytraced for this magnet, except that it includes contact 6 of release Einstead of contact 5 of relay T.

With lock magnet NM energized, the leverman xrel-ay L. ,With relay Lenergized, a circuit will gized in the reverse direction. energized inthe reverse direction, magnet RM of contact [3 of relay K.

acme-s5 'willmove lever V to its D position, thereby com pleting asecond circuit forenergizing the reverse winding of relay -A, which isthe sam'eas the circuit previously traced for this winding "except thatit includes contact 6 of release E instead of contact 5- of relay T. I I

that it includes contact 21 of release E, and the back point of'contact28' of relay L, instead of contact 26 of release E and the front pointof contact 28 of relay L. Magnet m will now be energized by the circuitpreviously traced; With magnets m andr energized, mechanism M will moveswitch F to its reverse position as previously described, causing relayK to again become ener- With relay K will become energized by thecircuit previously traced, and hence the leverman can complete themovement of lever V to its R position.

If, for some reason, switch F should have moved only part way from itsnormal to itsreverseposition, pole-changer P would not become closed inits reverse position, and hence relay K would remain deenergized. Withrelay K 'deenergized, magnet RM would also remain deenergized, and hencethe leverman could not complete the movement of lever V to its reverseposition R. With apparatus embodying my invention, the leverman can nowmove the switch back and forth from its normal position tothe obstructedposition in an attempt to remove the obstruction. For each such movementof the switch back and forth while relay T remains deenergized, theleverman must return release E to its intermediate position to closecontact 6, and then return it to its reverse position to close contact21. Such operation of release Eenforces a time delay for eachsuchcperation of switch F. i

Assuming'that the switch has failed tocomplete its movement to itsreverse position and that the leverman desires to return the switch toits normal position, hewill return lever V toits position B and willreturn release E to its intermediate position, thereby closing contactfor energizing be completed for energizing the normal winding of relayAwhich is the same as the;circuit previously traced for the reversewinding of this relay through contact-6 of releaseE as far as wire 22,and then passing through contact 23 of lever V and the normal winding ofrelay A'totermin'al o.

The leverman will now returnrelease-E to its reverseposition for closingcontact 21; A'circuit i Will thereby be completed for energizingthenormal control magnet n, passing from terminal b,

through contact 21 of release E, back point'of contact 28 of relay L,contact 29 of relay 'A in its right-hand position, contact Sli'of lever'V and the winding of magnet n to terminal 0. Since relayK is stilldeenergized on account "of switch F not having completed its operationto the reverse position, magnet m will'be energized by its circuitpreviously traced through the back point With magnets'n and m energized,switch F will be returned to its normal position by mechanism M. Withswitch F again in its normal position, pole-changer P will be in itsnormalposition, and

hence relay K will again be-energized by current of normal polarity.With relay K energized by current of normal polarity, a third circuitwill be completed for energizing lock magnet NM, passing from terminalI), through the front point of contact E3 of relay K, contact M of leverV, contact l5 of relay K in its left-hand position, contact i fi oflever V, wire ll, and the winding" of magnet NM to terminal 0.

. Withmagnet NM energized, the leverman can continue themovement oflever V from its B to its Nlposition if he so desires. He may desire todothis in order to permit a signal to be cleared for governingtraficmovements over switch F in its normal position.

If, however, he desires to again attempt to reverse switch F, he willnow again return release .E to its intermediate position, this operationrequiring a time delay. With release E in its intermediateposition,contact 6 will again be closed and the procedure will then be aspreviously described for the former attempt to move switch F to itsreverse position under the control of release E. 1

It will be apparent from the foregoing description that the apparatusshown in the accom- Ipanying drawing permits the operator to moveclaims, without departing from the spirit and scope of my invention.

Having thus described my invention, what I claim is:

1. In combination with a railway switch having a normal and a reverseposition, a manually operable lever movable between a normal and areverse position, a normal contact controlled by 'said lever whichbecomes closed when the lever is moved near to its normal position andremains closed thereafter until the lever is moved near to its reverseposition, a reverse contact controlled 'by said lever which becomesclosed when the lever is moved near to its reverse position and remainsclosed thereafter until the lever is moved near 1 to its normalposition; a manually operable time releasing device having a normallyclosed back contact which opens when said device isactuated from itsnormal position, a normally open middle contact which becomes closedfora brief finterval during actuation of said device following theopening of said back contact, and a normally 'open front contact whichbecomes closed after the expiration of a time interval during saidactuation subsequent to the opening of said middle contact; a lockrelay, means governed by trafiic conditions for energizing said relay,means including a first front contact of said relay for preventingmovement of said lever from the normal or-from the reverseposition;means for moving said switch from the normal to the reverse positionunder normal conditions including the back contact of said device, asecond front contact of said relay, and said reverse contact, effectivewhen said lever is moved from its normal near to its reverse position;means for moving the switch from the reverse to the normal positionunder said second front contact, and said normal contact, effective whensaid lever is moved from its reverse near to its normal position; meanscontrolled by said middle contact for energizing said relay underemergency conditions; means for moving said switch from the normal tothe reverse position under emergency conditions including the frontcontact of said device, a back contact of saidrelay, and said reversecontact, effective when said lever is moved from its normal near to itsreverse position; and means for moving said switch from the reverse tothe normal position under emergency conditions including said frontcontact of the device, said back contact of the relay and said normalcontact, effective when said lever is moved from its reverse near to itsnormal position.

2. In combination with a railway switch having a normal and a reverseposition, a manually operable lever movable between a normal and areverse position, a time releasing device having a middle contact whichbecomes closed for a brief interval upon actuation of said device and afront contact which becomes closed at the expiration of a time intervalfollowing the opening of said middle contact; a first contact whichbecomes closed when the lever is moved from its reverse near to itsnormal position provided said middle contact is closed, said firstcontact remaining closed thereafter until the lever is moved near to itsreverse position; a second contact which becomes closed when the leveris moved from its normal near to its reverse position provided saidmiddle contact is closed, said second contact remaining closedthereafter until the lever is moved near to its normal position; meanscontrolled by said lever and including said second contact as well assaid front contact for moving said switch to the reverse position, andmeans controlled by said lever and including said first contact as wellas said front contact for moving said switch to the normal position.

3. In combination with a railway switch having a normal and a reverseposition, a manually operable lever having N, B, D and R positions, alock relay, a first contact controlled by said lever and by said relaywhich becomes closed when the lever is moved to its B position providedsaid relay is energized and remains closed thereafter until the lever ismoved to its D position, a second contact also controlled by said leverand by said relay which becomes closed when the lever is moved to its Dposition provided said relay is energized and remains closed thereafteruntil the lever is moved to its B position, a manually operable timereleasing device having a middle contact which becomes closed for abrief period after a time interval during actuation of said device and afront contact which becomes closed after the expiration of an additionaltime interval following the opening of said middle contact, meanscontrolled by said relay when said relay is deenergized for preventingmovement of the lever from its N or its R position, means controlled bysaid middle contact for energizing said relay, means controlled by thefront contact of said device and by said second contact effective -whensaid relay is deenergized and said lever is moved to its D position formoving said switch to the reverse position, and means controlled by thefront contact of said device and by said first contact effective whensaid relay is deenergized and said lever is moved to the B position formoving said switch to the normal position.

4.. In combination with a railway switch having a normal and a reverseposition, a manually operable lever having N, B, D and R positions, amanually operable time releasing device which assumes a first positionupon the expiration of a first time interval during actuation and whichsubsequently assumes a second position upon the expiration of anadditional time interval, means controlled by said device for at timespreventing movement of the lever from its N or its R position unlesssaid device occupies said first position, a first contact which becomesclosed when said device occupies said first position and the lever ismoved to its B position remaining closed thereafter until the lever issubsequently moved to the D position, a second contact which becomesclosed when said device occupies said first position" and the lever ismoved to its D position remaining closed thereafter until the lever issubsequently moved to the B position, means controlled by said secondcontact effective when said device occupies said second position and thelever is moved to its D position for moving said switch to the reverseposition, and means controlled by said first contact efiective when saiddevice occupies said second position and the lever is moved to its Bposition for moving said switch to the normal position.

5. In combination, a stretch of railway track including a switch, amanually operable lever having a first and a second position, a firstcontact controlled by said lever which becomes closed when said lever ismoved to its first position and which then remains closed until saidlever is moved to its second position, a second contact controlled bysaid lever which becomes closed when said lever is moved to its secondposition and which then remains closed until said lever is moved to itsfirst position, a traflic contact responsive to traffic on said trackadjacent said switch so that said contact is closed when said stretch oftrack is unoccupied adjacent said switch and said contact opens when atrain approaches said switch, a manually operable time release having anormally closed contact which opens as soon as operation of said releaseis begun and a middle contact which closes after an interval in theoperation of said release and which then opens as operation of saidrelease is continued as well as a reverse contact which closes after afurther interval during the operation of said release, means controlledby said normally closed contact and by said first and second contactsfor controlling operations of said switch to its normal and reversepositions while said traflic contact is closed, means controlled by saidtrafiic contact for at times preventing operation of said first andsecond contacts while said traffic contact is open, means controlled bysaid middle contact for permitting operation of said first and secondcontacts while said traffic contact is open,

and means controlled by said reverse contact and by said first andsecond contacts for controlling operations of said switch to its normaland reverse positions respectively while said traific contact is open.

6. In combination, a stretch of railway track including a switch, amanually operable lever having a first and a second position, apolarized relay, a polar contact of said relay having a normal and areverse position and which when said relay becomes deenergized remainsclosed in' the position corresponding to the last previous direction ofenergization of said relay, a manually operable release having a normalposition and a middle position and also a reverse posi-i tion, meanscontrolledby said. release.in-=its middle position or by the unoccupiedcondition, of

said stretch adjacent said switch as: 1.811.585 by said lever initsfirst or its second position for controlling said polarized relay,means. controlled by said release inv itsnormal position and :by-said:polarized relay and also bysaid lever for controlling operation of saidswitchxto its normal or: its reverse position when there is no.tra-fiicwon. said stretch adjacent said switch, and means controlled bysaid release in its reversepositionand: by said polarized'relay forcontrolling operation of said switch to its normal or it'sreverseposition, when said stretch of track is occupied by aJtrainadjacentsa'id switch;

7. In combination, a stretch of railway track including a switch, amanually controllable lever having first and a second position, amanually controllable time release having a normal posi-- tion and amiddle position and also a reverse position, means controlled by saidtime release in its normal position and by said lever for controllingoperations of said switch when said stretch of track is unoccupiedadjacent said switch, a first contact controlled by said time release inits middle position and by said lever in its first position, a secondcontact controlled by said time release in its middle position and bysaid lever in its second position, and means controlled by said timerelease in its reverse position and by said first and second contactsfor controlling operations of said switch to its normal and reversepositions if said lever is operated to its first and second positionsrespectively while said stretch of track is occupied adjacent saidswitch.

8. In combination, a stretch of railway track including a switch, amanually controllable lever having a first and a second position, amanually controllable time release having a normal position and a middleposition and also a reverse position, means controlled by said timerelease in its normal position and by said lever for controllingoperations of said switch when said stretch of track is unoccupiedadjacent said switch, a first contact which closes in response to theclosing of a circuit controlled by said time release in its middleposition and by said lever in its first position said first contact thenremaining closed until said lever is moved to its second position, asecond contact which closes in response to the closing of a circuitcontrolled by said time release in its middle position and by said leverin its second position said second contact then remaining closed untilsaid lever is moved to its first position, and means controlled by saidtime release in its reverse position and by said first and secondcontacts for controlling operations of said switch to its normal .andreverse positions when said lever is operated to its first and secondpositions respectively while said stretch of track is occupied adjacentsaid switch. I

9. In combination, a stretch of railway track including a switch,manually controllable lever having a first and a second position, amanually controllable time release having a normal position and a middleposition and also a reverse position, means controlled by said timerelease in its normal position and by said lever for controllingoperations of said switch when said stretch of track is unoccupiedadjacent said switch, polarized relay, means controlled by said timerelease in its middle position and by said lever in its first and secondpositions for energizing said polarized relay in normal and reversedirectionsrespectively, and means controlled by saiditime release-initslreverse position and by said polarized relay for controllingoperationsof said switch -toits normal and reverse positionsWhensaidlever is operated to its first and second.

lease in its ifirst position and by said lever in :its

first position, second contact controlled by said time release in itsfirst position and by said lever in its second position, and meanscontrolled by said time release in its second position and by said firstand second contacts for controlling operations of said switch to itsnormal and reverse positions if said lever is operated to its first andsecond positions respectively while said stretch of track is occupiedadjacent said switch.

11. In combination, a stretch of railway track including a switch, amanually controllable lever having .a first and a second position, amanually controllable time release having a first and a second position,means including said lever for controlling operations of said switchwhen said stretch of track is unoccupied adjacent said switch, a firstcontact controlled by said time release in its first position and bysaid lever in its first position, a second contact controlled by saidtime release in its first position and by said lever in its secondposition, and means controlled by said time release in its secondposition and by said first and second contacts for controllingoperations of said switch to its normal and reverse positionsirrespective of whether the last previously attempted operation of saidswitch was completed or not.

12. In combination, a stretch of railway track including a switch, amanually controllable lever having a first and a second position, amanually controllable time release having a normal position and a firstand a second reverse position, means including said time release in itsnormal position and said lever for controlling operations of said switchwhen said stretch of track is unoccupied adjacent said switch, apolarized relay, means controlled by said time release in its firstreverse position and by said lever in its first and second positions forenergizing said polarized relay in the normal and reverse directions,and means controlled by said time release in its second reverse positionand by said polarized relay for controlling operations of said switch toits normal and reverse positions irrespective of whether the lastpreviously attempted operation of said switch was completed or not. 7

13. Apparatus for the control of a movable device comprising atwo-position control lever and a two-position storing relay adapted toremain in its last-operated position when deenergized, a locking relayenergized only when conditions are favorable for the operation of thedevice, means effective when the locking relay is energized and thelever is moved from one position to the other to operate the storingrelay to a corresponding position, and a control circuit closed onlywhen the locking relay is energized for operating the device to aposition corresponding to that of said storing relay.

' 14. Apparatus for the control of a movable device comprising a controlmember and a storing relay each having a normal and a reverse position,a locking relay responsive to conditions adjacent the device, meanscontrolled by the locking relay and effective when the member is movedfrom one position to the other to operate the storing relay to aposition corresponding to that to which the member is moved providedconditions adjacent the device are favorable for operation of thedevice, and means for operating the device comprising a circuitincluding, in series, corresponding contacts of the member and of thestoring relay and also a contact closed by the locking relay ifconditions adjacent the device are favorable for operation of thedevice.

15. Apparatus for the control of a movable device comprising a controlmember and a storing relay each having a normal and a reverse position,a locking relay energized only when conditions are favorable foroperation of the device, means effective when the member is moved fromone position to the other to operate the storing relay to a positioncorresponding to that to which the member is moved provided the lockingrelay is then energized, and a control circuit for operating the deviceclosed only when the member and the storing relay occupy correspondingpositions and only while said locking relay is energized.

CHARLES A. BROOKS.

